Is there a way to calculate when you conceived?

Hayley • ~IT'S A GIRL!! 💕baby # 2 due May/June 2019~ 💙William Jack 17-08-17 💙
My periods didn't regulate after coming off bc so I didn't have one for 3 months before I got a positive hpt... obviously I couldn't calculate how far along from day of last period. I'm now 12 weeks 4 days. Any advice is appreciated! 

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